Traction plate for use with motor-vehicle wheels



www3! sept. 1s 1923.

v As. B. JOHNSON TRATION PLATE FOR USE WITH MOTOR VEHICLE WHEELS Filed March 24, 1925 Patented Sept., 18, 1923..V

heheh@ *orties f serrare. n.Y :."rorrusiou,` or roeren, irressscnusnrrs. V A! YTheorien l ri-.Jian ron. USE .wirft reorouvnnrcnn: WHEELS.

W Appiication mea March e4, 1923. serial No. 627,491.

To czZZu/homfzt-mug/concern.' 5* i Beit known that l, 'SOPHIA B. JonNsoN,

a citizen of the United States, residingjat Boston, inthe county ot Suffolk State otMassachusetts, have invented new "and usefullmprovements in Traction YPlates lfor Use withi Motor-Vehicle Wheels, otfwhichf per surface, substantially flush with the curb, the said plate being' formed for YpartialV insertion under the tire'` of a drivingHV wheel, andfits frictional'upper surface being,` adapted to term a track with which the tire tread may be rictionally engaged by rotation ot' the wheel, said surface being adapted to positively support and minimize Yslippingo an elastic tire tread thereon.

@t the accompanying drawings 1forming a part ot this speciication,- Y

Figure 1 is a perspective view ot a traction plate embodying the invention. Figure 2 is a section on line 2-2 of .Fig-

' ure 1. y

`Figure 3 yis a sectionon line 35-3 of Fign ure 1. Y

The same reference characters indicate the same parts in all ot1 the figures.

In the drawings, 12 represents the bottom, and 13 the marginal curb or wall ofV a shallow rigidpan, said bottom and curb being` preferably integral with'each other 40 and composed of sheet steel, or other suitable metal,` about one-eighth ot an inch thick, although the thickness may be 2greater vor loss. The curb surrounds the bottom and proie'ctsv upwardly therefrom.

The plate includes a tiller occupying;A the pan and havinga frictional upper surface, substantially Hush with'the curb, the filler being lirmly secured tov the pan. VThe filler may bev ot any suitablematerial or combinatien of materials, whereby its upper surface is adapted to itrictionally engage an elastic tire tread andjcause suthcient trae.

.tion to enable the wheel having said tire to climb, when rotated, out of a rut, the plate being forniedso that one of its ends may be inserted in a rut and under a portion of a'tire-tr'ead lttherein, as shown by Fig ure 2.? Sa1d`i'rictional upper surface is ot such'naturef thatitpositively supports and minimizes'slipping` et `an elasticV tread thereon; i

I prefer to employ in the `formation of the iller, cubical blocks 15, of alundum tile, av product manufactured by the YNorton Company, of l/Vorcester, Massachusetts. This material is composed in part, of granular material, such as carbormidum, and has a high degree of tensile'and compressive strength, toughness and adhesion to cement mortar.Y lts texture is such that the tire tread has an effective trictional engagement Vwith -the upper surfaces of the' blocks, so

that the traction Vis suilicient to enable the tire to roll progressively on the upper sur Y tace of the plate.`

The blocks are secured to eachother, and to the pan bycementitious material 16, such as the variety of cement known as asphalt mastic. This material is orioinally heated to renderit plastic or semi-fluid, and a sutil cient body ot it is placed in the pan be- `tore the blocks are inserted. The blocks may be cemented to one side of a sheet ot lexibleV cloth, the blocks being so assembled that when they are inserted in the pan, interstices are termed' between their adjacent edges projecting 'from the sheet and between the `outer edges of the outermost blocks and the curb.V The cloth sheet is then placed on the pan, with the blocks projecting downward, and the blocks are pressed into the now plastic body ot cement, until the cement iills'the said interstices, and rises to the upper edge of the curb and the upper sides of the blocks. 'E he thickness or height of the blocks is such that when the cloth sheet is substantially flush with the curb, the under sides ot the blocks are separated from the bottom. of the pan by a space which is filled with the cement. The plate is next placed in a suitable press and allowed to .remain therein Vuntil the cement is solidi.- ied and adheres firmly to the blocks and to the bottom and curb of the pan. Finally the cloth sheet is stripped off, the plate being thus completed and ready for use.

I am not limited to the filler materials and construction above specified, and may employ other materials, and otherwise construct the iiller to provide a rictional surtace and firmly unite the material forming said surface to the pan.

n Y and. longitudinally Figures l and 2.V Transverse spurs 18, composed of metal The Yplate preferably of oblong form,

curved', as shown by angle pieces, may be'-Welcled or otherwise secured to thebottom of the pan, to pre- QWhen the eementitious material is asphalt y pressure ofa tirefupon theirV upper surfaces and y corners, liability of fracture.. l v I claim: y y 1. A traction plate ycomprising aA shallow .pan Composedcfa bottom and a marginal curb rising from-thebottom; and a filler occupying andsecured tothe pan and having a rigid frictional upper surface forming a Wheel track, Vand` adapted. to positively [support andIminimizeslipping of an elastic tire tread thereon.

y52 YA traction plate comprising a shallow pan composed of la bottom and a marginal curb rising from `the'bottom; and a filler occupying and secured to the pan and having `a frictional upper surface forming a thus minimizingY wheel track, said finer. being @imposed f rigiclgbloclrs of Vfri'cticnal material, sepa-rated fromeach other andfrom the curb by inter- Y stices, and cementitious material adherent.V

to the curb` V and to 'theblocka andV occupy ing said .interstices....`

pan` composed of bottom' andV a marginal ing a frictionalupper surface formingf'a rigid Vblocks of ffrictional-material .separated from each other and frornthecurbby inter`V curb rising from the bottom anclaf'llerV occupying. andsecured to the pan -an'clhavsVVV y' Wheeltrack,l said filler being-izomposedfof;

stices, ancljfrcmithe' bottom by ajspace','and

cementitiousV material 4 z'iclherent to the bot-I tom, the curb, and the'blocks, ancloc'c'upy ing said interstices and space.-

il.v A composite traction plate comprising. Y Y a VrigidV metallicY pan land 'a' filon-metallic 5o rigid frictionalsurface: forming aV Wheelf Y iiller securecltc the pan',l and presenting a track, and adaptedt-o positively support-and thereon.`

In testimonyA whereofl -I have ailiXed my signature.

soPHiA YB...ioiii'as`ou@` 'minimize Vslippingyof an elastic tireltreadf.

lws y 3. Ai vtractiof'n plate'comprising a shallow j 

